In journalism just one fact that is false prejudices the entire work. In contrast, in fiction one single fact that is true gives legitimacy to the entire work. That's the only difference, and it lies in the commitment of the writer. A novelist can do anything he wants so long as he makes people believe in it.
Some people work with a trainer, some people work with a stylist. I work with a celebrity fecalist. A fecalist is basically a person who comes and collects my stools, and then examines them to see if I'm eating right and if I should be drinking more water and what my moods should be.